TX HB1671

Creates a presumption that courts should order retroactive child support beginning from the earliest possible date of the child's conception, as determined by a physician using standard medical practice or other evidence including parental testimony

Requires courts to order retroactive child support upon finding of parentage (changed from permissive "may" to mandatory "shall"), including an equitable portion of all prenatal and postnatal health care expenses

Allows pregnant mothers to request in utero genetic testing to establish paternity before birth, and permits parentage proceedings initiated by the pregnant mother to conclude before the child is born

Permits acknowledgment or denial of paternity to take effect upon filing with the vital statistics unit, removing the previous requirement to wait until the child's birth date

Applies to orders, acknowledgments, and proceedings on or after the effective date of September 1, 2025